Automatic electric lawn mower



Jan. 2, 1940. P. CHERNOW AUTOMATIC-ELECTRIC LAWN MOWER Filed Sept. 2,1938 m s n WM Mmmm H C P. r

Patented Jan. 2, 1940 UNITED STATES PATENT OFFICE AUTOMATIC ELECTRICLAWN MOWER Paul Chernow, Los Angeles, Calif. Application September 2,1938, Serial No. 228,217

1 Claim.

This invention relates to lawn mowers.

Anobject of the invention is to provide a simple, practical andeiiicient machine of the character described.

Another object is to provide an improved and simplified motor lawnmower.

Other objects and advantages will appear and be brought out more fullyin the following specification, reference being had to the accompanyming drawing wherein Fig. 1 is a plan view of an embodiment of myinvention. u

Fig. 2 is a side view of the same.

Fig. 3 is a side view partly broken away of a cord reel and Fig. 4 is aperspective view of a modified form of the cutter.

Referring more-particularly to the drawing, I show a lawn mower having aframe 6, traction wheels 8 and adjustable guide wheels I. A shaft 3suitably mounted between frame members 5 carries a rotary cutter 3 and afixed cutter blade I. is suitably secured to frame members 3.

The machine is provided with the usual handle 24 on one end of thesteering and push bar 25 that is suitably secured by yoke arms 26 to theframe members 5. Brackets 21 and 21' mounted on the bar 25 and frame 5respectively. serve as 5 .32 and by a bracket 33 suitably supported on aFrame 3 supports a motor ll having a pulley 25 I2 which drives a beltl3, the latter in turn driving a pulley ll on shaft 3. Traction wheels 6are driven by internal gears on a shaft ll suit-v ably mounted onframemembers I, shaft I! being driven by pulley l3 mounted thereonwhichin turn is driven by belt I! running over a pulley II on shaft I! ofmotor ll.

Pulley I8 is formed to provide a diametrically recessed clutch elementl3' and is not fixed to the shaft l3, but is connected thereto througha. a clutch member 23 keyedto and slidably mounted on the shaft l3 andprovided with an annular groove having mounted therein a stud l3 securedto an arm 2|, connected by a rod 22, to an operating lever 23. Clutchmember 20 inpedestal 34. Cable 30 terminates in a pair of contacts 35which makes sliding contacts with rings 36 to which the ends of powercable wires 31 are connected. Spiral spring 38 is connected 15 betweendrum 3| and shaft 32 and is adapted to keep cable 30 wound thereonduring the movement of the lawn mower about a yard.

An auxiliary sidewalk trimmer in the form of a disk 39 having a cuttingedge, is adapted to 20 be detachably secured to shaft 3 and used whendesired.

In Fig. 4 I show a shaft 40 having a plurality of peripherally tootheddisk-like cutters 4| secured thereto in equi distantly spaced relation,25 and the cutters ll are especially adapted for cutting devil grass.Shaft 40 is adapted to be used in place of shaft 8 and cutter 9 when itis desired 'to cut devil grass.

' wheels, clutch controlled motor operated driv- 35 4 cludes a lug 20'for fitting the recess of the clutch member l3. and it will be obviousfrom Figure 1, I that the lug 23' is movable into and out of the recessof the clutch member II for engagement and disengagement of the clutchmembers, to bring about starting and stopping of the traveling movementof the machine along the ground,

ing means connected to said shaft for driving the same, cutting meansincluding a shaft bridging and flournaled in the frame members and beinof a length to provide a portion extending a considerable distancelaterally and outwardly beyond 40 one of said frame members, a cuttingdisk carried by the outer end" of the extending portion and detachablyconnected thereto, and means between the driving means and the lastmentioned shaft for driving the latter. 5

PAUL CBERNOW.

